Add riscv specific selftest for hardhardware breakpoints. These tests are based on: tools/testing/selftests/breakpoints/breakpoint_test_arm64.c
Signed-off-by: Jesse Taube jesse@rivosinc.com --- The selftest fails as register_user_hw_breakpoint seemingly does not call arch_install_hw_breakpoint. The test also seems to fail on arm64 in the same way when I tested it.
RFC -> V1: - New commit --- tools/perf/tests/tests.h | 3 +- tools/testing/selftests/riscv/Makefile | 2 +- .../selftests/riscv/breakpoints/.gitignore | 1 + .../selftests/riscv/breakpoints/Makefile | 12 + .../riscv/breakpoints/breakpoint_test.c | 246 ++++++++++++++++++ 5 files changed, 262 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/riscv/breakpoints/.gitignore create mode 100644 tools/testing/selftests/riscv/breakpoints/Makefile create mode 100644 tools/testing/selftests/riscv/breakpoints/breakpoint_test.c
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h index 8aea344536b8..5ff35304c11a 100644 --- a/tools/perf/tests/tests.h +++ b/tools/perf/tests/tests.h @@ -183,7 +183,8 @@ DECLARE_SUITE(util); * Just disable the test for these architectures until these issues are * resolved. */ -#if defined(__powerpc__) || defined(__s390x__) || defined(__arm__) || defined(__aarch64__) +#if defined(__powerpc__) || defined(__s390x__) || defined(__arm__) || defined(__aarch64__) || \ + defined(__riscv) #define BP_SIGNAL_IS_SUPPORTED 0 #else #define BP_SIGNAL_IS_SUPPORTED 1 diff --git a/tools/testing/selftests/riscv/Makefile b/tools/testing/selftests/riscv/Makefile index 099b8c1f46f8..96aba246cb3e 100644 --- a/tools/testing/selftests/riscv/Makefile +++ b/tools/testing/selftests/riscv/Makefile @@ -5,7 +5,7 @@ ARCH ?= $(shell uname -m 2>/dev/null || echo not)
ifneq (,$(filter $(ARCH),riscv)) -RISCV_SUBTARGETS ?= abi hwprobe mm sigreturn vector +RISCV_SUBTARGETS ?= abi hwprobe mm sigreturn vector breakpoints else RISCV_SUBTARGETS := endif diff --git a/tools/testing/selftests/riscv/breakpoints/.gitignore b/tools/testing/selftests/riscv/breakpoints/.gitignore new file mode 100644 index 000000000000..9b3193d06608 --- /dev/null +++ b/tools/testing/selftests/riscv/breakpoints/.gitignore @@ -0,0 +1 @@ +breakpoint_test diff --git a/tools/testing/selftests/riscv/breakpoints/Makefile b/tools/testing/selftests/riscv/breakpoints/Makefile new file mode 100644 index 000000000000..91e1c02c0073 --- /dev/null +++ b/tools/testing/selftests/riscv/breakpoints/Makefile @@ -0,0 +1,12 @@ +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2021 ARM Limited +# Originally tools/testing/arm64/abi/Makefile + +CFLAGS += -I$(top_srcdir)/tools/include + +TEST_GEN_PROGS := breakpoint_test + +include ../../lib.mk + +$(OUTPUT)/breakpoint_test: breakpoint_test.c + $(CC) -static -o$@ $(CFLAGS) $(LDFLAGS) $^ diff --git a/tools/testing/selftests/riscv/breakpoints/breakpoint_test.c b/tools/testing/selftests/riscv/breakpoints/breakpoint_test.c new file mode 100644 index 000000000000..faeecc72da12 --- /dev/null +++ b/tools/testing/selftests/riscv/breakpoints/breakpoint_test.c @@ -0,0 +1,246 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2016 Google, Inc. + * + * Original Code by Pavel Labath labath@google.com + * + * Code modified by Pratyush Anand panand@redhat.com + * for testing different byte select for each access size. + * Originally tools/testing/selftests/breakpoints/breakpoint_test_arm64.c + */ + +#define _GNU_SOURCE + +#include <asm/ptrace.h> +#include <sys/types.h> +#include <sys/wait.h> +#include <sys/ptrace.h> +#include <sys/param.h> +#include <sys/uio.h> +#include <stdint.h> +#include <stdbool.h> +#include <stddef.h> +#include <string.h> +#include <stdio.h> +#include <unistd.h> +#include <elf.h> +#include <errno.h> +#include <signal.h> + +#include "../../kselftest.h" + +#define MAX_BP_SIZE 8 + +static volatile uint8_t var[3*MAX_BP_SIZE] __attribute__((__aligned__(MAX_BP_SIZE))); + +static void child(int size, int wr) +{ + volatile uint8_t *addr = &var[MAX_BP_SIZE + wr]; + + if (ptrace(PTRACE_TRACEME, 0, NULL, NULL) != 0) { + ksft_print_msg( + "ptrace(PTRACE_TRACEME) failed: %s\n", + strerror(errno)); + _exit(1); + } + + if (raise(SIGSTOP) != 0) { + ksft_print_msg( + "raise(SIGSTOP) failed: %s\n", strerror(errno)); + _exit(1); + } + + if ((uintptr_t) addr % size) { + ksft_print_msg( + "Wrong address write for the given size: %s\n", + strerror(errno)); + _exit(1); + } + + switch (size) { + case 1: + *addr = 47; + break; + case 2: + *(uint16_t *)addr = 47; + break; + case 4: + *(uint32_t *)addr = 47; + break; + case 8: + *(uint64_t *)addr = 47; + break; + } + + _exit(0); +} + +static bool set_watchpoint(pid_t pid, int size, int wp) +{ + const volatile uint8_t *addr = &var[MAX_BP_SIZE + wp]; + const int offset = (uintptr_t)addr % 8; + const unsigned int type = 2; /* Write */ + const unsigned int enable = 1; + struct __riscv_hwdebug_state debug_state; + struct iovec iov; + + memset(&debug_state, 0, sizeof(debug_state)); + debug_state.addr = (uintptr_t)(addr - offset); + debug_state.len = size; + debug_state.ctrl = enable; + debug_state.type = type; + iov.iov_base = &debug_state; + iov.iov_len = sizeof(debug_state); + if (ptrace(PTRACE_SETREGSET, pid, NT_RISCV_HW_BREAK, &iov) == 0) + return true; + + if (errno == EIO) + ksft_print_msg( + "ptrace(PTRACE_SETREGSET, NT_RISCV_HW_BREAK) not supported on this hardware: %s\n", + strerror(errno)); + + ksft_print_msg( + "ptrace(PTRACE_SETREGSET, NT_RISCV_HW_BREAK) failed: %s\n", + strerror(errno)); + return false; +} + +static bool run_test(int wr_size, int wp_size, int wr, int wp) +{ + int status; + siginfo_t siginfo; + pid_t pid = fork(); + pid_t wpid; + + if (pid < 0) { + ksft_test_result_fail( + "fork() failed: %s\n", strerror(errno)); + return false; + } + if (pid == 0) + child(wr_size, wr); + + wpid = waitpid(pid, &status, __WALL); + if (wpid != pid) { + ksft_print_msg( + "waitpid() failed: %s\n", strerror(errno)); + return false; + } + if (!WIFSTOPPED(status)) { + ksft_print_msg( + "child did not stop: %s\n", strerror(errno)); + return false; + } + if (WSTOPSIG(status) != SIGSTOP) { + ksft_print_msg("child did not stop with SIGSTOP\n"); + return false; + } + + if (!set_watchpoint(pid, wp_size, wp)) + return false; + + if (ptrace(PTRACE_CONT, pid, NULL, NULL) < 0) { + ksft_print_msg( + "ptrace(PTRACE_CONT) failed: %s\n", + strerror(errno)); + return false; + } + + alarm(3); + wpid = waitpid(pid, &status, __WALL); + if (wpid != pid) { + ksft_print_msg( + "waitpid() failed: %s\n", strerror(errno)); + return false; + } + alarm(0); + if (WIFEXITED(status)) { + ksft_print_msg("child exited prematurely\n"); + return false; + } + if (!WIFSTOPPED(status)) { + ksft_print_msg("child did not stop\n"); + return false; + } + if (WSTOPSIG(status) != SIGTRAP) { + ksft_print_msg("child did not stop with SIGTRAP\n"); + return false; + } + if (ptrace(PTRACE_GETSIGINFO, pid, NULL, &siginfo) != 0) { + ksft_print_msg( + "ptrace(PTRACE_GETSIGINFO): %s\n", + strerror(errno)); + return false; + } + if (siginfo.si_code != TRAP_HWBKPT) { + ksft_print_msg( + "Unexpected si_code %d\n", siginfo.si_code); + return false; + } + + kill(pid, SIGKILL); + wpid = waitpid(pid, &status, 0); + if (wpid != pid) { + ksft_print_msg( + "waitpid() failed: %s\n", strerror(errno)); + return false; + } + return true; +} + +static void sigalrm(int sig) +{ +} + +int main(int argc, char **argv) +{ + int opt; + bool succeeded = true; + struct sigaction act; + int wr, wp, size; + bool result; + + ksft_print_header(); + ksft_set_plan(213); + + act.sa_handler = sigalrm; + sigemptyset(&act.sa_mask); + act.sa_flags = 0; + sigaction(SIGALRM, &act, NULL); + for (size = 1; size <= MAX_BP_SIZE; size = size*2) { + for (wr = 0; wr <= MAX_BP_SIZE; wr = wr + size) { + for (wp = wr - size; wp <= wr + size; wp = wp + size) { + result = run_test(size, MIN(size, 8), wr, wp); + if ((result && wr == wp) || + (!result && wr != wp)) + ksft_test_result_pass( + "Test size = %d write offset = %d watchpoint offset = %d\n", + size, wr, wp); + else { + ksft_test_result_fail( + "Test size = %d write offset = %d watchpoint offset = %d\n", + size, wr, wp); + succeeded = false; + } + } + } + } + + for (size = 1; size <= MAX_BP_SIZE; size = size*2) { + if (run_test(size, 8, -size, -8)) + ksft_test_result_pass( + "Test size = %d write offset = %d watchpoint offset = -8\n", + size, -size); + else { + ksft_test_result_fail( + "Test size = %d write offset = %d watchpoint offset = -8\n", + size, -size); + succeeded = false; + } + } + + if (succeeded) + ksft_exit_pass(); + else + ksft_exit_fail(); +}